Julia 1.0 Programming Cookbook

How it works...

In order to understand how the dot operator (.) works, it is best to study the possible results from different ways of applying to broadcast to rand(length(x)) in our preceding example:

• Case 1: Not broadcasting rand(length(x))—in this case, the result is a 10-element Vector{Float64}.
• Case 2: Broadcasting the rand.(length(x)) outer function—in this case, the result is also a 10-element Vector{Float64}. The reason for this is that rand.(length(x)) is rewritten by Julia to something similar to broadcast(v -> rand(v), length(x)), and because we are effectively broadcasting over one element where length(x) is 10, and nothing changes.

• Case 3: Broadcasting the rand(length.(x)) inner function—in this case, the result is 1. This ...